Wednesday:
Valve adds a special attribute to the Eliminate the Impossible (Medic Sherlock Holmes) set that causes the descriptions of the previous day to change into a quote from "The Adventure of the Copper Beeches" a Sherlock Holmes story.

Thursday:
Valve adds an error code when crafting two banana peels. Each code shows a specific error, which, when pieced together, is assumed to form 4 QR codes that lead to images
The images together formed this: http://wiki.teamfortress.com/w/image...Transcript.jpg
It's the transcript from the Poopy Joe congressional hearing.

Friday:
Pyro wrote a blog post! If you convert the pyro gibberish into Morse code, it spells "MONDAY" or, if you include the title "A MONDAY" but let's forget the latter and assume monday night is the night!

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All this means is that it will be unable to be read without logging in. I know r/tf2 on Reddit is lurking to get more info on this update. If the thread does get cached and you get a message telling you to log in, just create an account and try again.

Wednesday:
Valve adds a special attribute to the Eliminate the Impossible (Medic Sherlock Holmes) set that causes the descriptions of the previous day to change into a quote from "The Adventure of the Copper Beeches" a Sherlock Holmes story.

Thursday:
Valve adds an error code when crafting two banana peels. Each code shows a specific error, which, when pieced together, is assumed to form 8 different PNGs.